The Earthshine Telescope Project

M. Owner-Petersen; T. Andersen; A. Ardeberg; P. Thejll; H. Gleisner

doi:10.1117/12.789134

10 July 2008 The Earthshine Telescope Project

M. Owner-Petersen, T. Andersen, A. Ardeberg, P. Thejll, H. Gleisner

Author Affiliations +

Proceedings Volume 7012, Ground-based and Airborne Telescopes II; 70122L (2008) https://doi.org/10.1117/12.789134
Event: SPIE Astronomical Telescopes + Instrumentation, 2008, Marseille, France

Abstract

The Earthshine telescope project is a collaborative effort between Lund Observatory (LO) in Sweden and The Institute of Meteorology in Demark (DMI) with the purpose of constructing one or more robotic telescopes to record the albedo of the Earth over a long time. The objective is to measure long-term development of the global cloud coverage and reflectivity for climate modeling. A 1% change in the Earth's albedo will result in an average temperature change of 0.5 K of the Earth, calling for high precision of the albedo measurements. This poses strict demands on the telescope design, in particular with respect to suppression of straylight. The paper describes our proposed optical and mechanical design of the Earthshine telescope, and presents a preliminary straylight analysis of the design.

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M. Owner-Petersen, T. Andersen, A. Ardeberg, P. Thejll, and H. Gleisner "The Earthshine Telescope Project", Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70122L (10 July 2008); https://doi.org/10.1117/12.789134

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